Tdub, I feel your pain!, Just went through this myself.
Normally I wear a US size 11 in shoes and went for an 11 Profile. My feet are quite wide,
never had a closed toe asymmetrical boot before and came from a Connelly Stoker.
First impressions off water...far too tight and cramped at toes. Ordered a 12 for comparison and it was huge. Foot was rattling about inside and I couldn't get the bottom lace to snug my forefoot up. Tightening the top bungee too far to compensate would have been hopeless and potential unsafe. Excessive length and volume, foot could twist inside boot when tightened off water.
Stuck with the original 11. It has packed out nicely after a few skis but still feels a little alien to me being closed toe. Fit wise it is very comfortable and snug.
I was going up a full size with the 12, so I think you going up a 1/2 size would be ideal as I would have liked just a tiny bit of extra foot length if possible but not the excess there was on the 12.
For what its worth I think you would find the 10 too tight but 11 should be spot on.
Hope this makes sense.